<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
    </head>
    <body>
        <script>
            Promise.resolve()
                .then(() => {
                    console.log(0);
                    return Promise.resolve(4);
                })
                .then((res) => {
                    console.log(res);
                });

            Promise.resolve()
                .then(() => {
                    console.log(1);
                })
                .then(() => {
                    console.log(2);
                })
                .then(() => {
                    console.log(3);
                })
                .then(() => {
                    console.log(5);
                })
                .then(() => {
                    console.log(6);
                });

            // 大家先思考一下
        </script>
    </body>
</html>
